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Yes it does, one of my client's site got sunk in the finance niche. When I studied its links, the site suddenly gain over 30k more links for its primary keyword with links coming from forum pages packed with porn, gambling, drugs. I also have done rep management projects in sinking sites as well. But so far it mixed results, some sites you can build hundreds of thousands of links and still holding up, while others can be sunk literally within a day or less. So bad links can in fact kill a site nowadays, at least a weak site.

Google hates bad link like broken link or dead links, as they are not user friendly, affects website's conversion rate, and also stop Search Engine Crawlers, so make sure you don't have these kinds of links..

Definitely. It's like having bad friends... sooner or later you gonna get home stoned and drunk too much and your wife is gonna kick you out hehehe
Now seriously, let's understand first what is a bad link.
Bad links are any link coming from a penalized, not trusted or not relevant to you niche sites. Google will count any of this as bad links which by association will influence in a negative way to your ranks.
Try to keep you backlinks as narrow as possible in terms of targeting.
Hope it helps!

Yes of course bad links affect ranking of a website, if do follow (good links ) increase the ranking like that bad links diminished the ranking.If Google realized the more links as a bad links,then Google reduced the rank.

Hi
Of course bed links will effect your ranking as well as traffic for you website. Sometimes your website get penalized by the search engine due to creation of bad links.
So always we need to prepare quality back link for our website to get the best result.

You should have ability to recognize bad links first, many newbies don't understand quality of links and they may classify a quality link as bad link..

If any link has pr0, pr na, it doesn't mean that it is a bad link, if the link is relevant then it is good link, you should link to that, but please try to maintain natural aspect of link building today, using same anchor text, building same number of links at daily basis wouldn't help a lot.

As Google said that you just create content, ranking would be decided based on content, so you have to understand this statement, as content is very important today, if you are giving time in on-page optimization, quality and fresh content then this is the best way of optimization today.

If you know how to hide the "bad links" you can probably get away with it. However, if you blasted your site with thousands of links overnight (low quality ones), that's going to raise a red flag and affect your site.

Yes it does, one of my client's site got sunk in the finance niche. When I studied its links, the site suddenly gain over 30k more links for its primary keyword with links coming from forum pages packed with porn, gambling, drugs. I also have done rep management projects in sinking sites as well. But so far it mixed results, some sites you can build hundreds of thousands of links and still holding up, while others can be sunk literally within a day or less. So bad links can in fact kill a site nowadays, at least a weak site.

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Why is a PORN backlink bad?

If the backlink from the PORN site is a PR9, why would it be considered a bad link? Because it's porn? Because its not niche related? Because its PORN?...lol

I dunno, maybe porn links distract the google workers too much? It just doesnt make sense to me how some links can be seen as bad, as links on other sites are not necessarily controlled by the site owner and its all too easy for others to damage my site.